Tanzania HIV/AIDS and Malaria Indicator Survey ... - Measure DHS
Tanzania HIV/AIDS and Malaria Indicator Survey ... - Measure DHS
Tanzania HIV/AIDS and Malaria Indicator Survey ... - Measure DHS
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To assess levels <strong>and</strong> trends in knowledge about <strong>HIV</strong>/<strong>AIDS</strong>, attitudes towards peopleinfected with the disease, <strong>and</strong> patterns of sexual behaviour; To collect information on the proportion of adults who are chronically sick, the extent oforphanhood, levels of <strong>and</strong> care <strong>and</strong> support; To gauge the extent to which these indicators vary by characteristics such as age, sex,region, education, marital status, <strong>and</strong> poverty status; <strong>and</strong> To measure the presence of malaria parasites <strong>and</strong> anaemia among children age 6-59months.The results of the 2007-08 THMIS are intended to provide information to assist policymakers<strong>and</strong> programme implementers to monitor <strong>and</strong> evaluate existing programmes <strong>and</strong> to design newstrategies for combating the <strong>HIV</strong>/<strong>AIDS</strong> epidemic in <strong>Tanzania</strong>. The survey data will also be used asinputs in population projections <strong>and</strong> to calculate indicators developed by the United Nations GeneralAssembly Special Session (UNGASS), the UN<strong>AIDS</strong> Programme, <strong>and</strong> the World Health Organization(WHO).1.5 SAMPLE SIZE AND DESIGNThe sampling frame used for the 2007-08 THMIS is the same as that used for the 2004-05T<strong>DHS</strong>, which was developed by NBS after the 2002 Population <strong>and</strong> Housing Census (PHC). Thesample excluded nomadic <strong>and</strong> institutional populations, such as persons staying in hotels, barracks,<strong>and</strong> prisons. The THMIS utilised a two-stage sample design. The first stage involved selecting samplepoints (clusters) consisting of enumeration areas delineated for the 2002 PHC. A total of 475 clusterswere selected. The sample was designed to allow estimates of key indicators for each of <strong>Tanzania</strong>’s26 regions. On the Mainl<strong>and</strong>, 25 sample points were selected in Dar es Salaam <strong>and</strong> 18 in each of theother 20 regions. In Zanzibar, 18 sample points were selected in each of the five regions, for a total of90 sample points.A household listing operation was undertaken in all the selected areas prior to the fieldwork.From these lists, households to be included in the survey were selected. The second stage of selectioninvolved the systematic sampling of households from these lists. Approximately 16 households wereselected from each sampling point in Dar es Salaam, <strong>and</strong> 18 households per sampling point wereselected in other regions. In Zanzibar, approximately 18 households were selected from each samplingpoint in Unguja, <strong>and</strong> 36 households were selected in Pemba to allow reliable estimates of <strong>HIV</strong>prevalence for each isl<strong>and</strong> group.Because of the approximately equal sample sizes in each region, the sample is not selfweightingat the national level, <strong>and</strong> weighting factors have been added to the data file so that theresults will be proportional at the national level.In the selected households, interviews were conducted with all women <strong>and</strong> men age 15-49.The THMIS also collected blood samples for anaemia <strong>and</strong> malaria testing among children age 6-59months, <strong>and</strong> dried blood spot (DBS) samples for <strong>HIV</strong> testing among women <strong>and</strong> men age 15-49.1.6 QUESTIONNAIRESTwo questionnaires were used for the 2007-08 THMIS: the Household Questionnaire <strong>and</strong> theIndividual Questionnaire. The questionnaires are based on the st<strong>and</strong>ard <strong>AIDS</strong> <strong>Indicator</strong> <strong>Survey</strong> <strong>and</strong><strong>Malaria</strong> <strong>Indicator</strong> <strong>Survey</strong> questionnaires, adapted for the population <strong>and</strong> health issues relevant to<strong>Tanzania</strong>. Inputs were solicited from various stakeholders representing government ministries <strong>and</strong>agencies, nongovernmental organizations, <strong>and</strong> international partners. After the preparation of thedefinitive questionnaires in English, questionnaires were translated into Kiswahili.4 | Introduction